Spark-plug



.l. O. BROCK.

SPARK PLUG.

APPLICATION FILED MAY 24. I920.

Patented Nov. 22, 1921.

El 11 uewfo'c QUOT/HQAA UNITED STATES JOHN O. BROCK, OF WILSON, NORTHCAROLINA,

SPARK-PLUG.

To all whom it may concern Be it known that I, JOHN O. BROOK, a citizenof the and resident of WVilson, in the county of Wilson and State ofNorth Carolina, have invented certain new and useful Improvements inSpark-,Plugs, of which the following is a specification.

This invention relates to spark plugs for internal combustion motors andhas for its object'the provision of novel means whereby air is forcedover the points of the ter-' minals at the spark gap to aid in retainingthese elements free of carbon or other deposits which will reduce theirconductivity, it being the purpose of this invention to have the airenter the cylinder with sufficient force to dislodge any deposits whichmight occur in the spark gap and result in a short circuit.

A further object of this invention is to produce a terminal on theelectrode of the spark plug having a very high resistance and to thatend a special meter wire is employed to aid in creating the resistance.

A still further object of this invention is to provide a hollowelectrode having novel means for holding a valve for" closing theopening or port through the electrode, so that pulsations of the air areallowed to enter the cylinder at the spark gap.

A still further object of this invention is to provide a novelarrangement of parts so assembled as to retain the elements in theiroperative relations to one another yet' permitting their disassociationfor the purpose of cleaning the spark plug, renewing worn or brokenparts and the like.

lVith the foregoingand other objects in view, the invention consists inthe details of construction, and in the arrangement and combination ofparts to be hereinafter more fully setforth and claimed.

In describing the invention in detail, reference will be had to theaccompanying drawings forming part of this specification wherein likecharacters denote corresponding parts in the severalviews, and in which-Figure 1 illustrates a view in elevation of a spar plug embodying theinvention;

Iiig. 2 illustrates a sectional view thereof; am

Specification of Letters Patent.

United States of'Americ'a,

Patented Nov. 22, 1921.

Application filed Kay 24, 1920. Serial No. 383,855.

Fig. 3 illustrates an enlarged detail sec tional view of the electrode.

In these drawings 5 denotes the shell or body of the spark plug havingthe usual threaded nipple 6 to be screwed into the cylinder head'orwall, and this body has the usual terminal 7 forming a conductor and thesaid body has a shoulder 8 on which the insulator 9 rests, the saidinsulator bein held in place by the ring nut 10 which is threaded in thebody, and for the purpose of producing leak proof joints between theseparts, the usual packing such as 11, 12 and 13 may be inserted.

The insulator 9 is of course hollow and is adapted to receive theelectrode 14, which electrode is threaded to engage a nut 15 which bearsagainst the outer end' of the insulator and tends to draw the electrodeoutwardly and the said electrode has a nut 16 threaded on it, bearingagainst a packing ringl? which lies in the recess or socket 18 in theinner end of the insulator.

The spark plug'is provided with a housing at its outer end consisting ofa sleeve 19 resting on the top of the ring'nut, and a head or face plate20 which is threaded on the electrode so as to bear against the outerend of the sleeve and the said electrode is provided with the usualbinding screw 21 to hold the terminal of the conductors for the ignitionsystem.

The inner end of the electrode is enlarged and has a downwardly flaredouter surface 22 which fits into the socket 18 in the insulator and thelower end of the electrode is further provided with internal threads 23to engage threads of a nipple 24 of the inner head25 of the electrode,the said nipple having a valve seat 26 formed on its inner end to engagea flat end of the conical valve 27, the remainder of the valveconforming approximately to the contour of the inner wall of the flaredportion of the electrode and operating as a control for air entering thecylinder through the electrode as the said valve pulsates on theinfluence of the intake and exhaust stroke of the piston.

The inner head is of'course provided with a port 28 to permitcirculation of air therethrough and the said inner head has a spirallyshaped terminal 29 which is adapted to coast with the terminal 7 forcreating From an inspection' of the drawing and from the foregoingdescription, the construction and operation of the device will, it isthought, he understood without a resume or statement of a cycle ofoperation by which the results indicated are attained.

I claim- 1. In a spark plug, a body, a' hollow insulator therein, meansfor holding the in sulator in place, a hollow electrode extendingthrough the said insulator, means for holding the electrode in place,an inner head threaded in the electrode and forming a valve seat, avalve within the hollow electrode operative in conjunction with thesaid' valve seat, and a-termmal of high resistance carried by beingcoiled as and for the purpose described.

2. In a spark plug, a body having a terminal thereon, a hollowelectrode, means for holding the hollow electrode in spaced relation tothe body, the inner end of the said electrode being flared and the innerwall thereof constituting a valve engaging element, a hollow headthreaded in the said flared portion of the electrode and having a valveseat at its inner end, a valve in the flared portion of the electrodeadapted to coact with the valve seat and the wall of the electrode toopen and close the passage through the electrode, and head, and meansfor holding the parts in assembled relation.

3. In a spark plug, a .body having a terminal thereon, a hollowelectrode, means for holding the hollow electrode in spaced rela tion tothe body, the inner end of the said the said head, the said terminalelectrode being flared and the inner wall thereof constituting a valveengaging element, a hollow head threaded in the said flared. portion ofthe electrode and having a valve seat at its inner end, a "valve in theflared portion of the electrode adapted to coact with the valve seat andthe wall of the electrode to open and close the passage through theelectrode and head, means for holding the parts in assembled relation,and a spirally wound terminal of high resistance carried by the head.

4. In a spark plug, a body, an insulator therein having a recess inits'inner end, an externallythreaded hollow electrode extend ing throughthe insulator, a nut threaded on the electrode bearing on the insulatorwhereby the position of the inner end of the electrode is adjustablyheld, a nut threaded on the said electrode and bearing against the outerend of the insulator, a housing comprising a sleeve embracing theelectrode near its outer end, a member threaded on the said electrodeand bearing against the outer end of the sleeve for holding the parts inassembled relation, a terminal carried by the inner end of theelectrode, and means for controlling the opening through the hollowelectrode according to the action of the piston cylinder to which thespark plug is applied. g

;5. In a spark plug, a body, an insulator therein, a terminal on thesaid body, a hollow electrode having a flared outer surface near itsinner end, the cavity within the said flared portion being likewiseflared, a valve seat threaded in thevend of the flared portion, and aconical valve adapted to coact with the wall of the flared portion ofthe electrode and with the valve seat.

JOHN D. BROOK.

